Add the pata kūteretere (softened butter), puehu huka (icing sugar) and wanira (vanilla) to a large bowl.
Whip for 5 minutes on high or until the mixture is almost white in colour and super fluffy in texture.
Add the Peanut Butter:
Add the pata pīnati māeneene (smooth peanut butter) and whip again for one more minute. The buttercream is now ready to use!
Pipe it, smear it or eat it out of the bowl if that’s what you need to do!
Store the Peanut Butter Buttercream:
This will keep in the fridge, in a sealed container for up to five days. If it has been sitting in the fridge longer than four hours, bring it to room temperature for 20 minutes and then whip it for a minute or so before using it.